A weather modification network (or weather control system) was a system used to alter the natural weather patterns of a planet, acting much like a world wide environmental system.

In 2369, a weather control net was in place on Earth that was designed to dissipate destructive weather phenomena such as tornadoes. Malfunctions were rare, such as the one created by the Q in order to execute the parents of Amanda Rogers, who had deserted the Q Continuum to live amongst Humans but subsequently violated their promise not to exercise their powers. (TNG: "True Q")